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How to Test MySQL 8.4 Compatibility on AWS RDS Before a Blue/Green Cutover

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AWS RDS Blue/Green Deployments offer a near-zero-downtime path for upgrading MySQL 8.0 instances to MySQL 8.4, the current Long Term Support release. However, the Green environment is read-only by design, which limits per-application compatibility testing before the final switchover. This becomes a significant obstacle when a single RDS instance hosts multiple projects with different upgrade readiness timelines. A workaround involves layering a snapshot-based test instance on top of the Blue/Green setup, allowing teams to validate each application individually against MySQL 8.4. Once all projects are confirmed compatible, a single coordinated switchover can be executed with minimal downtime.

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